The solar system and time Flashcards
Aphelion is the point during orbit around the sun where -
the earth is farthest from the sun
Perihelion is the point during orbit around the sun where -
the earth is closest to the sun
Aphelion occurs approximately in -
July 4th
Perihelion occurs approximately in -
January 4th
The change of seasons is due to?
The inclination(tilt) of the earth
The earth’s spin axis(approximately N/S, in reference to the orbital plane around the sun, is tilted at an angle of -
66.5 degrees.
In the NH winter solstice occurs -
on 21st of December
In the SH winter solstice occurs -
on 21st of June
In the NH summer solstice occurs -
on 21st of June
In the SH summer solstice occurs on -
21st of December
In the SH autumn equinox occurs on -
March 21st
In the NH spring equinox occurs on -
March 21st
In the SH spring equinox occurs on -
September 21st
In the NH autumn equinox occurs on -
September 21st
If the North Pole is tilted at its maximum possible angle towards the sun, which hemisphere will experience winter?
Southern Hemisphere
If the North Pole is tilted at its maximum possible angle away from the sun, which hemisphere will experience winter?
Northern Hemisphere
The apparent solar day is of -
variable length and not suitable for time keeping
An apparent solar day is always longer than -
a sidereal day
The mean solar day(exactly 24 hours) is used as the -
basis for time keeping
The type of “day” definition that is not constant?
An apparent day
1 hour of a mean solar day = how many degrees?
15 degrees
LMT(local mean time) is the same for a given meridian irrespective of -
latitude
To convert LMT to UTC/Zulu/GMT time, the mnemonic is?
Longitude East, UTC least
Longitude West, UTC best
UTC =
GMT